disabled daughter. and now, he says, he learned something for all of us. >>> good evening. think of it as a one, two, three political punch. exactly six weeks to go until the november election, and three of the most famous names in america are heading out to fight for their candidates. first lady michelle obama, now joining former president bill clinton and former alaska governor sarah palin, as the power hitters on the campaign trail. and the president, well, today, we learned that as the elections loom, he is going to shake up and rebuild his economic team. more on that in a minute. but we'll begin with our senior political correspondent jon karl. jon? >> reporter: diane, today we learned that the president's top economic adviser will leave after the midterm elections. this is the third member of the president's economic team to go. and this, we learn on a day that the white house also announced that the first lady is about to hit the campaign trail. the white house calls her the closer. and with time running out for congressional democrats, they're sending her in. the first la
